hi all,can someone tell me if the transmission ( 741 c/2) that is in my cabrio 356 C 1965 is the same that the one in a 356 SC of the same yearReason for this question is that the 356 C has 75 HP,the SC 90 or 95 HP and if i drive long and fast on the highway the RPM is approx 3500 to 3700which is high and Noisy ( in fact a 5 th gear is missing…) So is the 4 th gear " engrenage" different in the 356 C from the 356 SC .in adding 20 to 25 HP did porsche also produce a more adapted transmission?thanks if somebody knowsmichel pitteloud geneva

Gear ratio's changed but I think all final drives are 1:1. There are different OD gear sets available (taller 4th gear), but obviously require complete teardown to install.

I would hate to lose the original 3-4 ratio, but with traffic cruising 80MPH these days, I would seriously consider going with a taller 4th gear if I plan to be driving long distance often (which I do).

And Tom Conway gets his tall 4th gear from: 356 Enterprises!But that is not what Pitteloud asked. The transmissions were geared the same for C and SC. In the USA, 4D, overseas, 4C.And the final drive ratio is 4.43:1, not 1:1.

We have a winner!!!!! If you guys want quiet start collecting Rolls Royces. Porsches are sporting thoroughbreds that should be kept "on the boil".

Ok, I put a 10% taller ring and pinion in the 2133cc car to quiet it down a little without losing the nice spacing of the gears. I don't know if that would be a good idea for the average engine though. I do like the C forth gear as an alternative for most engines. The crazy tall 4th is not a good idea for everybody due to the big 3/4 gap. Different horses for different courses.

+1 to Vic. We have run several 150+HP Carrera 2 and 904 engines in 356's with no transmission issues.

Another +1 on the 4C gear. I changed the 4D to a 4C in my daily driver 356SC coupe with big bore kit. Great highway cruiser and better fuel mileage with no loss of drivability. The guy I sold my car to complemented the tall gear as well.

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